package com.anjingsi.tools.recall;

import java.math.BigInteger;
import java.util.*;

public class Null {
    public static void greet() {
        System.out.println("Hello world!");
    }

    public static void main(String[] args) {
        Map<String, String> m =
                new IdentityHashMap<String, String>();
        m.put("Mickey", "Mouse");
        m.put("Mickey", "Mantle");
        System.out.println(m.size());
        System.out.println(Integer.MIN_VALUE+"-------------"+Integer.MAX_VALUE);
    }
}